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Introduction to Database System

Introduction to Database System
A form defines

the width of each field
none of the listed here
where data is placed on the screen
both of the listed here

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Introduction to Database System
Which of the following refers to something that can be identified in the user's work environment, something that the users want to track?

Entity
Relationship
Attribute
Identifier

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Introduction to Database System
A relation is a two-dimensional table.

False
True

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Introduction to Database System
Relationship classes are associations between entity classes.

True
False

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Introduction to Database System
If a piece of data is stored in two places in the database, then

both (a) and (b)
None of these
changing the data is one spot will cause data inconsistency
it can be more easily accessed
storage space is wasted

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Introduction to Database System
Data encryption techniques are particularly useful for

reducing storage space requirements
None of these
protecting data in data communication systems
improving data integrity
All of these

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